A novel quantum multi-signature protocol based on locally indistinguishable orthogonal product states

摘要

In many cases, more than one person are needed to sign a message. In this paper, we propose a quantum multi-signature protocol based on orthogonal product states which cannot be perfectly distinguished by local operations and classical communication. In the protocol, the message is encoded as a quantum sequence of orthogonal product states. Different particles of each orthogonal product state are transmitted separately, which can ensure information security with fewer decoy states in the transmission process. Security analysis and efficiency analysis show that our protocol is secure and efficient.